Thickness of wood-frame extension to meet BR.

Discussion in 'Builders' Talk' started by David DD, Feb 14, 2019.

  1. David DD

    David DD Member

    I want to add a small extension in an area 1.8 x 3m on the side of my house, primarily as use as a utility and storage room. Access would be via an existing external door.
    Use of double skin brick walls with cavity would make the interior far too small so I was thinking of using wood frame construction with Kingspan-type insulation and plasterboard on top.
    How thick would such a wall need to be to meet building regs? (The floor and roof will be similarly constructed). I was thinking 100mm thick.
     
  2. Jord86

    Jord86 Screwfix Select

  3. stevie22

    stevie22 Screwfix Select

    5x2 optimum. Stronger than 4x2 but you have room for 100 celotex between studs with an airga.
     

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